QUESTION:

Do you have an example demonstrating confinement/compression of an o-ring using ogden hyperelasticity and contact?


ANSWER:

I found some old files in which I use curve fitting to obtain 3 parameter Ogden hyperelastic coefficients. I incorporated this material data in a simple 2D axisymmetric o-ring model including contact that I found in the release 5.5 structural nonlinearities training notes.

The model uses pure displacement formulation, NOT mixed u-P. I could not get it to converge with mixed u-P.

I am not clear on just what the implications of this are, although the documentation asserts that mixed u-P is more robust for nearly incompressible problems.


QUESTION:

Do you have an example demonstrating confinement/compression of an o-ring using ogden hyperelasticity and contact?


ANSWER:

I found some old files in which I use curve fitting to obtain 3 parameter Ogden hyperelastic coefficients. I incorporated this material data in a simple 2D axisymmetric o-ring model including contact that I found in the release 5.5 structural nonlinearities training notes.

The model uses pure displacement formulation, NOT mixed u-P. I could not get it to converge with mixed u-P.

I am not clear on just what the implications of this are, although the documentation asserts that mixed u-P is more robust for nearly incompressible problems.





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